#include <iostream>
using namespace std;

int main()
{
	int m, t, s;
	cin >> m >> t >> s;
	if(t == 0)
	{
		cout << 0 << endl;
		return 0;
	}
	if(s % t == 0)
		cout << ((m - s / t) > 0 ? (m - s / t) : 0) << endl;
	else
		cout << ((m - s / t - 1) > 0 ? (m - s / t - 1) : 0) << endl;
	return 0;
}
